In Double Shear Appendix VI. > and -7 = /s 1077 2-05 .-. When £ = >-i6 J s t = So that below i'o5// thickness the bearing stress is more than twice the shear. The full value of the shear is, however, rarely reckoned upon; indeed, the joint is usually treated as though it •i -Z -3 -4 -5 n—i—i—i—r PL* T£ •7 -e 1 — i THICKNESS i . 955. were in single shear, though of a better construction than a lap joint* The Board of Trade adopt the number 175 as the ratio of fy =/g, but even then, as will be seen from the design in Kg. 955, all butt joints below *8 in. plate must necessarily be treated as lap joints.